Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb3f8d293274e2c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 21:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d885b6eb419db92795e6a0395dfb7daa SHA-1: d6abb512d81bcd8bb0e573351cbb36573c06c0ca SHA-256: edb3f8d293274e2cbf26df257456b7aba807c595d57d4c2d0bb7b0f587b7ede6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of numerous embedded URLs, some leading to potentially malicious content, supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4def2b618f5481cd8dd729a7f41ec005/nuwitimonigube.pdf In PDF document text
    • https://hw-power.com/uploads/ckfiles/files/60e941c717816.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/vudigosarajegos.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/dogatefiberuxuvakawuv.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/jt91ajdp1gd2b760p9biih2vu5/26341432831.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/30621777730.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/jexubenegavifa.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/mofuzenelezufe.pdfIn PDF document text
    • http://rc-modeller.se/images/file///60001221127.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f012a529a6b---zogajesevigoluz.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/rosivisabotijag.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/25461795507.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/41834693073.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/90653709228.pdfIn PDF document text
    • http://zaiger.ru/img/file/63088499019.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/lewewavagusivorirawor.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f982c4f5---61933081667.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/komusaboxos.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090398e4278a---bevonefalek.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/86753915418.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083ac5d255---wupenaxititosarabinafuwa.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/wegafirejeruv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086808f76089---5627197471.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b23c7782---gowikipolamaxidagiloxof.pdfIn PDF document text
    • http://sns.hu/_user/file/89251037697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=interview+with+a+social+worker+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 10908 bytes
SHA-256: d81e5c71ea7809249787ae532feb61f9735d7448a9a406926e6b68f9d834d8ee
font_01_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 17452 bytes
SHA-256: 1ba368b1bf63fdee3a25a2baf559af14f726dea04a3cb09864630931a3fc018e

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